From d0ec6706ad65b6d760da74f5d437d973fe1e8a23 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Mon, 25 Jan 2016 13:05:00 -0800
Subject: [PATCH] drm/vc4: Validate that WAIT_BO padding is cleared.

This is ABI future-proofing if we ever want to extend the pad to mean
something.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/gpu/drm/vc4/vc4_gem.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -761,6 +761,9 @@ vc4_wait_bo_ioctl(struct drm_device *dev
 	struct drm_gem_object *gem_obj;
 	struct vc4_bo *bo;
 
+	if (args->pad != 0)
+		return -EINVAL;
+
 	gem_obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 	if (!gem_obj) {
 		DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
